pds_core: specify auxiliary_device to be created

In preparation for adding a new auxiliary_device for the PF,
make the vif type an argument to pdsc_auxbus_dev_add().  Pass in
the address of the padev pointer so that the caller can specify
where to save it and keep the mutex usage within the function.

Link: https://patch.msgid.link/r/20250320194412.67983-3-shannon.nelson@amd.com


Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>